Depress i on-pulley



(No Model.)

W. DUNHAM. DEPRESSION PULLEY.

Patented June 7, 1887.

UNITED STATES PATENT OFFICE.

\VARREN DUNHAM, OF IGO, GALIFORNIA. v

DEPRESSlON-PULLEY.

SPECIFICATION forming part of Letters Patent No. 364,400, dated June '7, 1887.

Serial No. 209,804 (No model.)

To aZZ whom it may concern.-

Be it known that I, WARREN DUNHAM, of lgo, county of Shasta, and State of California, have invented an Improvement in Depression- Pulleys; and I hereby declare the following to be a full, clear, and exact description thereof.

Myinvention relates to the class of depression-pulleys for cable roads; and my invention consists in the novel split or separable pulley, the means for opening it to release the rope, the means for closing it, and the details of construction, which I shall hereinafter fully describe.

Depressioupulleys are used at changes of grade in the line of the road, the object being to hold the cable down to conform to the general line of its travel in the tube or tunnel. Sometimes these pulleys are fixed or stationary, in which case they are peculiarly located; and the gripping device is also constructed in such a way that it removes the cable to one side as it passes the pulley, thereby avoiding interference.

Sometimes deprcssionpulleys are mounted in pivoted frames, so that they may be knocked out of the way by the passing grip, the pulleys being returned to position by a weight.

It is the object of my invention to provide a simple and effective pulley of this class, the construction and operation of which are essentially different from those now in use.

Referring to the accompanying drawings, Figure 1 is a perspective view of my depression-pulley, showing it as opening by the action of the passing-grip. Fig. 2 is a section of the pulley G, showing it closed and holding the cable down.

A is the roadbed. B is the tube or tunnel, having gripslot b. C is the traveling cable, and D is the approaching grip.

The road-bed A may be supposed to have a change of grade at the line as x, and at this point is located the depression pulley by which the cable is held down.

I) is a frame secured transversely in the tunnel and having slotted standards 6, in which are mounted rollers e, formingbearings for the bars F, which are guided in the upper portion of the frame E and travel between the rollers. Upon the meeting or adjacent ends of these bars are mounted the parts of the depression pulley G. These parts on the one side coni journaled sist of the shallow roller g, having a wide guard-flange, g, on its inner end and pivoted on a fixed journal-pin, y", the head g' of which holds the roller in place, a washer, 9*, being placed between the flange of the roller and the end of the bar F. On the other side are pivoted or mounted loosely one or two guarddisks, 9 the inner one of which has a central socket in which the head 9 of the pin 9 is seated when the parts of the pulley are fitted together. It will be seen thatthe cable passes under the roller 9, being guided on each side by the flange g of the roller and the guarddisk 9 which rotates and is thereby anti- .frietion. To the adjacent ends of the bars F are also secured the brackets H, in which are the.vertically-arranged rollers h.

Upon the frame of the grip D is a V-shaped cam, I, extending front :and rearaud on each side of the grip.

Extending upwardly from the upper hori= zontal bars of frame E are arms a", to which are pivoted the cam'levers J, the outer ends of which are provided with weights \V, and their inner curved ends pass loosely down between anti-friction rollers f, mounted on studs f, secured in the bars F, and extending therefrom through elongated slots 6 made in the side of the top bars of frame E.

The operation of my depression-pulley is as follows: The weighted cam-levers J normally hold the parts of the pulley G together,and the rope or cable is thereby held down by and under the roller 9. When the grip D approaches, the point or nose of the cam I is inserted be tween the rollers h, and they are thereby forced apart, the bars F by which they are carried moving baekwardly and separating the parts of pulley G, whereby an opening is presented through which the grip passes without interfcrence. As the rollers h are relieved by the moving rear end of cam I on the grip, the weighted cam-leversJ force thebars Ftogether again until, the grip having fully passed, the parts of the pulley G come together again easi] y and accurately over the cable or rope.

The movements of all the parts taking place on rollers, there will be as little friction as possible in the operation.

IOU

The depression-'pulley,as deseribed,opening Having thus described my invention, what I cla1m as new, and desire to secure by Letters Patent, i

1. A depression-pulley for eable-roads,consisting of a pivoted or journaled roller and an oppositely moving guard disk, 9 both mounted in sliding frames, in combination with a cam on the grip for separating said pulleys, and weights for returning the parts of the pulley to a closed position, substantially as herein described.

2. A depression-pulley the parts of which are separable and oppositely moving, and consist of thepivoted orjournaled roller 9, having a guard-flange on its inner end, and the opposing rotatable guard-disk g for the outer end of the roller, substantially as described.

3. The oppositely-sliding bars F, mounted in a suitable frame transversely of the cableroad tunnel, in combination with the separale pulley G, for holding the cable down, said pulley consisting of the rotating flanged roller 9, journaled on one bar F, and the rotatable guardvdisk g journaled on the opposite bar, substantially as described.

4. The sliding bars F, the separable pulley G, as described, mounted in said bars, and the vertical rollers h on the bars, in combination with a cam on the traveling grip acting on the rollers h for forcing the bars F in opposite directions, and weighted levers for returning them, substantially as described.

cable railway, having the standards 6, with rollers e, the sliding bars F, mounted on said rollers and having guide studsf, with rollers f, the vertical rollers h on the ends of the arms or bars, the flanged roller 9 on one bar, and the rotatable guard-disk g on the other, in combination with the V-shaped cam I on the traveling grip,operating between the rollers 71, for forcing the bars F apart, and the pivoted weighted camlevers J, operating between the rollersf, for returning said bars, substantially as described.

In witness whereof I have hereunto set my hand.

WARREN DUNHAM.

\Vitnesses: 7

C. D. COLE, J. H. BLOOD, 

